1. The first amplifier is the Grace Digital, the GDI-BTAR512, for $136.
2. You can use almost any amplifier or receiver with your speakers.
3. Both sell for the same price and offer exotic technology and amazing sound, but have very different amplifier requirements.
4. The key is matching an amplifier to the speakers.
5. Your best bet is to get an integrated amplifier, or a separate amplifier and preamplifier.
6. The amplifier is connected to a preamplifier.